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At low temperature and high field, Bi-2212 wires have the highest critical current density (J c ), and the isotropic round wires are more easily to design solenoid than the tapes. So the Bi-2212 wires are the preferred conductor for high-field solenoids. If the J c of Bi-2212 wires was highest, the diameter of core of the wires was about 20μm. It is so thin that some cores were broken...
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